Port 464: kpasswd
Port 464 is used to change a Kerberos password, separate from the authentication traffic on port 88. A Kerberos client contacts this port on the Key Distribution Center whenever a user updates their password.
TCP/UDPAuthenticationUnencrypted by defaultIANA assigned
| Port number | 464 |
|---|---|
| Service | Kerberos password change |
| Protocol | TCP/UDP |
| Category | Authentication |
| Default encryption | No |
Security note. Port 464 is not encrypted by default. Restrict it to trusted networks, or use an encrypted alternative where one exists, to avoid exposing credentials and data in transit.
Frequently asked questions
What is port 464 used for?
Port 464 is used to change a Kerberos password, separate from the authentication traffic on port 88. A Kerberos client contacts this port on the Key Distribution Center whenever a user updates their password.
Is port 464 TCP or UDP?
Port 464 (kpasswd) uses TCP/UDP.
Is port 464 secure?
Port 464 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 464 on my firewall?
Only if you specifically need kpasswd. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.